Magnetoacoustic emission and Barkhausen noise of cobalt nickel oriented silicon steel and permalloy

The profiles of MAE and BN for Co, Ni, oriented Fe-3.5% Si, and permalloy between -Hmax to +Hmax were investigated under 0.5 and 1 Hz triangle applied magnetic field. The profiles of Co (contained 180 deg. domain walls only) under different Hmax and different frequency show that the peak to peak voltage of MAE increase when the Hmax and frequency are increasing, and the shape of the profiles of MAE is similar to that of BN under the same condition. But for Ni the shapes of profiles of MAE and BN are not similar to each other. It means that the sources of MAE and BN for Co are the same i.e. 180 deg. domain wall motion. Not only the motion of non-180 deg. domain wall but also 180 deg. domain wall motion are the source of MAE. Besides that, domain wall nucleation and annihilation are also the sources of MAE